How do negative feelings or negative vibration prevent Spiritual Ascension ?
well when someone practice spirituality . he start to attract higher energies , higher vibes in form of peace primly. these energies first enter into his energy field and start removing bad energies, bad vibrations of one's pain ,depression but if he is continuing with non veg diet . It increase workload for positive energy.The battle between good and bad energies result in form of detoxification,which have to faced by person who is practicing spirituality. That'swhy if he is doing his practice along with taking non veg diet he is just empowering both energies.
Like doing practice he give more positive energy to his energy field and simultaneously he is also taking other bad vibes and provide more negative vibes to his energy field .
in such cases sometime he feel very positive ,peace , love when higher power get stronger than lower power and sometime he may feel excess feeling of lust ,greed,rage when lower power get stronger than higher power.
this may happen in those case where person even dont take non.veg,then it is consider that he either have more negativity in his energy field or he is absorbing negative vibes from something or someone.